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Q: How many 5 digit numbers contain exactly two 7 in them?

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18

There are 22680 numbers, excluding those with leading 0s.

18 of them.

1

27: 077,177,277,377,477,577,677,877,977,717,727,737,747,757,767,777,787,797

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18

There are 22680 numbers, excluding those with leading 0s.

21

13

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17

18 of them.

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1

There are 9000 4-digit numbers. 8*9*9*9 = 5832 of them do not contain a 5 The remaining 3168 contain a 5.

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